CN214672683U - Battery single-side electrode plate rolling device - Google Patents

Abstract

The utility model provides a rolling device for a single-side electrode plate of a battery, which comprises a compression roller component, a first coiling and uncoiling device and a second coiling and uncoiling device, wherein the compression roller component is provided with a compression roller gap; the first coiling and uncoiling device is used for installing an electrode sheet coil, and an electrode sheet uncoiled from the electrode sheet coil penetrates through the compression roller gap; the second coiling and uncoiling device is used for installing a protective film coil, a protective film uncoiled from the protective film coil penetrates through the compression roller gap, and the protective film is positioned on one side of the electrode sheet, which deviates from the coating layer of the electrode sheet. The utility model discloses a roll in protection film and single face electrode slice simultaneously, can utilize the protection film to offset the curling stress that single face electrode slice produced on the electrode slice after the roll-in, prevent that the electrode slice from appearing the phenomenon of curling after the roll-in.

Description

Battery single-side electrode plate rolling device

Technical Field

The utility model relates to a technical field is made in the battery sheet production, especially relates to a battery single face electrode slice roll-in device.

Background

With the increasing demand of the modern society on batteries, the requirements on the quality and the energy density of the batteries are higher, and the production and the manufacture of the electrode plates of the batteries are used as important process procedures in the production of the batteries, and the process level of the production and the manufacture directly influences the manufacturing cost and the energy density of the batteries. In the manufacturing process of the soft package lithium ion battery, in order to reduce the weight of the battery and improve the energy density, the electrode plate exposed on the outermost side of the core package is often manufactured into a single-sided electrode plate, but in the rolling process of the single-sided electrode plate, because the two side surfaces of the electrode plate are stressed unevenly, the electrode plate is easy to curl, and great operation difficulty is brought to subsequent sheet manufacturing and assembling processes.

In the prior art, a special graphite, namely crystalline flake graphite is added into a formula of a single-sided anode and cathode material, the graphite structure is in a fish scale shape, the crystalline flake graphite has the capability of parallel sliding during rolling and fills the gap position between microscopic spherical materials, so that the stress generated during rolling of the spherical material is reduced, the rebound after rolling is relieved, meanwhile, a single-sided film substrate is folded in half or two layers of single-sided film substrates are rolled together after being overlapped, and the uncoated metal surfaces are opposite during overlapping, which is equivalent to that the single-sided film substrate is rolled as a double-sided film substrate; in another prior art, the stress generated in the roll pressing process is balanced by coating a light material, a hot melt adhesive or a high polymer material and the like on the other side of the single-sided electrode sheet, so that the purpose of reducing the curling of the single-sided electrode sheet after rolling is achieved.

In the prior art, the performance of the battery is influenced by changing the formula of the anode and cathode materials, and meanwhile, the requirement on the consistency of the surface density and the width of the electrode plate is higher when the electrode plate is folded or rolled in an overlapping way; on the other hand, because the ductility of the coating material and the ductility of the active material are not consistent, the stress after the ductility can only be partially offset, and the coating thickness and the rolling compaction of the active material of different battery cells are not consistent, the corresponding material coating needs to be verified again, which causes the waste of manpower and material resources, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery single face electrode piece roll-in device for the problem that curls appears easily after the roll-in of single face electrode piece among the solution prior art.

The utility model provides a battery single face electrode slice roll-in device, include: the compression roller assembly is provided with a compression roller gap; the first coiling and uncoiling device is used for installing an electrode sheet coil, and an electrode sheet uncoiled from the electrode sheet coil penetrates through the compression roller gap; and the second winding and unwinding device is used for installing a protective film coil, a protective film which is unwound from the protective film coil penetrates through the compression roller gap, and the protective film is positioned on one side of the electrode sheet, which deviates from the coating layer of the electrode sheet.

According to the utility model provides a pair of battery single face electrode slice roll-in device, the compression roller subassembly includes first compression roller and second compression roller, form between the roll surface of first compression roller and the roll surface of second compression roller the compression roller seam.

According to the utility model provides a pair of battery single face electrode slice roll-in device, the compression roller subassembly still includes roll gap adjusting device, roll gap adjusting device connects first compression roller with at least one among the second compression roller, in order to follow first compression roller with radial line direction between the second compression roller is adjusted the size of compression roller gap.

According to the utility model provides a battery single-side electrode plate rolling device, the first winding and unwinding device comprises a first unwinding roller and a first winding roller, and the first unwinding roller and the first winding roller are respectively positioned on two sides of the compression roller assembly; the first unwinding roller is used for installing the electrode sheet roll which is unwound in advance, and the first winding roller is used for installing the electrode sheet roll which is wound in advance.

According to the utility model provides a battery single face electrode slice roll-in device, the second receive and releases the rolling device and includes second unwinding roller and second wind-up roll, second unwinding roller and second wind-up roll are located the both sides of compression roller subassembly respectively; the second unwinding roller is used for installing the pre-unwound protective film roll, and the second winding roller is used for installing the pre-wound protective film roll.

According to the utility model provides a battery single face electrode piece roll-in device, battery single face electrode piece roll-in device still includes pull roll subassembly; the traction roller assembly is used for drawing the conveying of the protective film which is uncoiled from the protective film coil.

According to the utility model provides a battery single face electrode slice roll-in device, the carry over pinch rolls subassembly includes first carry over pinch rolls and second carry over pinch rolls; the first traction roller is arranged between the second unwinding roller and the compression roller assembly and is used for adjusting the tension of the protective film between the second unwinding roller and the compression roller assembly so that the protective film is attached to the electrode sheet before passing through the compression roller gap; the second traction roller is arranged between the pressing roller assembly and the second winding roller and used for adjusting the tension of the protective film between the pressing roller assembly and the second winding roller, so that the protective film and the electrode plate which are compounded after being rolled are separated after the protective film and the electrode plate are output from the pressing roller gap by preset length.

According to the utility model provides a battery single face electrode slice roll-in device, the electrode slice includes basic unit and coating, the coating is formed at one of them side of basic unit, the protection film is used for attaching to another side of basic unit under the roll-in of compression roller subassembly; the thickness of the protective film is larger than or equal to that of the base layer, and the width of the protective film is larger than or equal to that of the coating layer.

According to the utility model provides a pair of battery single face electrode slice roll-in device, what arbitrary material was made in the middle of the protection film includes PP, PVP, PTFE, PET is from the type membrane, perhaps, the protection film includes the compound type membrane that two kinds of at least materials were made in the middle of PP, PVP, PTFE, PET.

The utility model provides a battery single face electrode slice roll-in device through roll-in protection film and single face electrode slice simultaneously, can utilize the protection film to offset the curling stress that single face electrode slice produced on the electrode slice after the roll-in, prevents that the electrode slice from appearing the phenomenon of curling after the roll-in.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery single-sided electrode plate rolling device provided by an embodiment of the present invention;

reference numerals:

1: a press roll assembly; 11: a first press roll; 12: a second press roll;

13: pressing a roll gap; 14: a roll gap adjusting device; 2: a first coiling and uncoiling device;

21: a first unwinding roller; 22: a first wind-up roll; 23: rolling the electrode sheet;

24: an electrode sheet; 25: a first adjusting device; 3: a second coiling and uncoiling device;

31: a second unwinding roller; 32: a second wind-up roll; 33: a protective film roll;

34: a protective film; 35: a second adjustment device; 4: a pull roll assembly;

41: a first pull roll; 42: a second pull roll; 43: a traction adjusting device.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a battery single face electrode slice roll-in device is described below with reference to fig. 1.

As shown in fig. 1, the present embodiment provides a rolling device for a single-sided electrode sheet of a battery, which includes a pressing roller assembly 1, a first winding and unwinding device 2, and a second winding and unwinding device 3, where the pressing roller assembly 1 has a pressing roller gap 13; the first coiling and uncoiling device 2 is used for installing an electrode sheet coil 23, and an electrode sheet 24 uncoiled from the electrode sheet coil 23 penetrates through the compression roller seam 13; the second winding and unwinding device 3 is used for installing a protective film roll 33, a protective film 34 which is unwound from the protective film roll 33 penetrates through the pressure roll gap 13, and the protective film 34 is positioned on one side of the electrode sheet 24, which is deviated from the coating layer of the electrode sheet.

Specifically, in the present embodiment, the protective film and the single-sided electrode sheet are simultaneously rolled, and the protective film is used to offset the curling stress generated on the electrode sheet after the single-sided electrode sheet is rolled, so as to prevent the electrode sheet from curling after rolling.

It should be noted here that the center axes of the platen roller assembly 1, the electrode sheet roll 23, and the protective film roll 33 are all horizontally arranged.

Specifically, the electrode sheet 24 includes a base layer and a coating layer, the coating layer is formed on one side of the base layer, the foil used in the base layer includes a copper foil and an aluminum foil, the thickness of the copper foil ranges from 4.5 μm to 10 μm, and the thickness of the aluminum foil ranges from 10 μm to 20 μm.

Specifically, the electrode plate 24 includes a positive electrode plate and a negative electrode plate, the material used for the base layer of the positive electrode plate is aluminum foil, and the material used for the negative electrode plate is copper foil; the layer density range of the anode electrode sheet is 11-30mg/cm²The layer density range of the negative electrode sheet is 3-15mg/cm²。

Preferably, the press roll assembly 1 comprises a first press roll 11 and a second press roll 12, and in order to ensure uniformity of rolling, a central axis of the first press roll 11 and a central axis of the second press roll 12 should be in the same plane; and a pressure roller gap 13 is formed between the roller surface of the first pressing roller 11 and the roller surface of the second pressing roller 12 and is used for rolling the electrode sheet 24 to obtain the electrode sheet 24 with smooth and flat surface, small volume and compact coating material.

Preferably, in order to ensure that the deformed and expanded portion of the electrode sheet 24 does not "overflow" the roller assembly 1 during the process of passing the electrode sheet 24 through the press nip 13, the width of the roller assembly 1 should be larger than the width of the electrode sheet 24 unwound from the electrode sheet roll 23.

Preferably, in order to avoid the phenomenon that the electrode sheet 24 is torn due to the relative sliding between the electrode sheet 24 and the press roll assembly 1 when passing through the press roll slit 13, the first press roll 11 and the second press roll 12 should provide sufficient static friction force for the electrode sheet 24, that is, a large positive pressure should be provided between the first press roll 11 and the second press roll 12, and in the process of implementation, the first press roll 11 and the second press roll 12 with large diameters should be selected as much as possible.

Preferably, the roller assembly 1 is driven by a motor to rotate, and in order to ensure uniformity of the rolling process, the linear speed on the roller surface of the first roller 11 and the linear speed on the roller surface of the second roller 12 should be consistent.

In one embodiment, as shown in fig. 1, the first pressing roller 11 and the second pressing roller 12 are respectively fixed on the roller gap adjusting device 14, in order to ensure the convenience of installation and the convenience of adjustment, the first pressing roller 11 is installed right above the second pressing roller 12, and the size of the pressing roller gap 13 can be adjusted by the roller gap adjusting device 14 to match the rolling requirements of different electrode sheets.

Specifically, the roll gap adjusting device 14 is connected to at least one of the first press roll 11 and the second press roll 12 to adjust the size of the roll gap 13 along the radial direction of the connection line between the first press roll 11 and the second press roll 12.

It will be understood that the roll gap adjusting device 14 is connected to the second press roll 12 to adjust the size of the press roll gap 13, in the case that the first press roll 11 is fixedly arranged and the second press roll 12 is movably arranged along the radial connecting line between the first press roll 11 and the second press roll 12.

Meanwhile, under the condition that the second pressing roller 12 is fixedly arranged and the first pressing roller 11 can be movably arranged along the radial connecting line direction between the first pressing roller 11 and the second pressing roller 12, the roller gap adjusting device 14 is connected with the first pressing roller 11 so as to realize the adjustment of the size of the pressing roller gap 13.

In addition, in the case where the first roll 11 and the second roll 12 are movable toward each other or away from each other along the radial direction of the line connecting the rolls, the roll gap adjusting device 14 is connected to each of the first roll 11 and the second roll 12 to adjust the size of the roll gap 13.

Preferably, the first winding and unwinding device 2 comprises a first unwinding roller 21 and a first winding roller 22, and the first unwinding roller 21 and the first winding roller 22 are respectively located at two sides of the pressing roller assembly 1; the first unwinding roller 21 is used for installing a pre-unwound electrode sheet roll 23, and the first winding roller 22 is used for installing a pre-wound electrode sheet roll 23; the first unwinding roller 21 and the first winding roller 22 are respectively driven to rotate by a motor.

Preferably, in order to ensure that the electrode sheet 24 is kept in a flat state at all times during unwinding and winding, the lengths of the first unwinding roller 21 and the first winding roller 22 in the axial direction should be greater than the width of the electrode sheet roll 23.

Preferably, in order to avoid the phenomenon that the electrode sheet 24 is pulled during the unwinding and winding processes, the unwinding speed of the first unwinding roller 21 should be matched with the winding speed of the first winding roller 22, and at the same time, matched with the linear speed at the nip 13 of the press roller assembly 1.

In one embodiment, as shown in fig. 1, the first unwinding roller 21 and the first winding roller 22 are respectively fixed on the first adjusting device 25, and in order to ensure the convenience of installation and good continuity, the roller surface of the first unwinding roller 21 on the upper side, the roller surface of the first winding roller 22 on the upper side, and the roller surface of the second pressing roller 12 on the upper side are all adjusted to be on the same horizontal plane by adjusting the first adjusting device 25.

Preferably, the second winding and unwinding device 3 comprises a second unwinding roller 31 and a second winding roller 32, and the second unwinding roller 31 and the second winding roller 32 are respectively located at two sides of the pressing roller assembly 1; the second unwinding roller 31 is used for installing a pre-unwound protective film roll 33, and the second winding roller 32 is used for installing a pre-wound protective film roll 33; the second unwinding roller 31 and the second winding roller 32 are respectively driven to rotate by a motor.

Preferably, in order to ensure that the protective film 34 is constantly laid flat during unwinding and winding, the widths of the second unwinding roller 31 and the second winding roller 32 should be larger than the width of the protective film roll 33.

Preferably, the second unwinding roller 31 and the second winding roller 32 are arranged on the side of the electrode sheet 24 facing away from the coating layer thereof. It is understood that if the coating layer of the electrode sheet 24 is disposed upward at the unwinding position, the second unwinding roller 31 and the second winding roller 32 are disposed below the first unwinding roller 21 and the first winding roller 22 in one-to-one correspondence; if the coating layer of the electrode sheet 24 is disposed downward at the unwinding position, the second unwinding roller 31 and the second winding roller 32 are disposed above the first unwinding roller 21 and the first winding roller 22 in a one-to-one correspondence.

Meanwhile, the width of the protective film roll 33 should be ensured to be equal to or greater than the width of the coating layer, so as to ensure the effective area of the protective film 34 on the electrode sheet 24 during the rolling process, to better balance the curling stress generated by the electrode sheet 24 during the rolling process, and to prevent the electrode sheet 24 from curling after the rolling process.

Preferably, in order to avoid the phenomenon that the protective film 34 slides relative to the electrode sheet 24 during the unwinding and winding processes, the unwinding speed of the second unwinding roller 31 should match the unwinding speed of the first unwinding roller 21, the winding speed of the second winding roller 32 should match the winding speed of the first winding roller 22, and meanwhile, the unwinding speed of the second unwinding roller 31 and the winding speed of the second winding roller 32 match the linear speed at the pressure seam 13 of the pressure roller assembly 1.

In one embodiment, as shown in fig. 1, the coating layer of the electrode sheet 24 faces upward at the unwinding position, and therefore, the second unwinding roller 31 is disposed below the first unwinding roller 21, the second winding roller 32 is disposed below the first winding roller 22, and the second unwinding roller 31 and the second winding roller 32 are respectively fixed on the second adjusting device 35.

Preferably, the embodiment is further provided with a traction roller assembly 4, before rolling, the traction roller assembly 4 is used for guiding the unreeled protective film 34 to be attached to the unreeled electrode sheet 24, and then the protective film and the unreeled electrode sheet enter the press roller gap 13 together for rolling; after the rolling is completed, the pulling roll assembly 4 is used for pulling the protective film 34 and the electrode sheet 24 to be separated so as to be respectively wound.

Preferably, the pulling roll assemblies 4 are respectively arranged at two sides of the press roll assembly 1, the pulling roll assembly 4 positioned at the same side of the second unwinding roll 31 is arranged between the second unwinding roll 31 and the press roll assembly 1, and the pulling roll assembly 4 positioned at the same side of the second winding roll 32 is arranged between the second winding roll 32 and the press roll assembly 1.

Preferably, in order to ensure that the protective film 34 and the electrode sheet 24 can be completely attached before entering the pressure roller gap 13, the position of the drawing roller assembly 4 on the same side as the second unwinding roller 31 cannot be too close to the pressure roller assembly 1; in order to ensure that the protective film 34 can sufficiently offset the curling stress of the electrode sheet 24 after the protective film 34 and the electrode sheet 24 pass through the nip 13, the protective film 34 and the electrode sheet 24 are separated after being attached for a certain distance, so that the position of the drawing roll assembly 4 on the same side as the second wind-up roll 32 cannot be too close to the press roll assembly 1.

Preferably, the number of pull roll assemblies 4 can be increased or decreased depending on the application. Preferably, the pulling roll assembly 4 is fixed on a pulling adjustment device 43, the pulling adjustment device 43 is used for adjusting the tension of the protective film 34; in order to avoid the phenomenon that the protective film 34 slips on the drawing roller assembly 4, the wrap angle of the protective film 34 on the drawing roller assembly 4 is adjusted through the traction adjusting device 43, and the friction force between the protective film 34 and the drawing roller assembly 4 is increased.

In one embodiment, as shown in fig. 1, to improve the ease of installation, the pull roll assembly 4 includes a first pull roll 41 and a second pull roll 42, the first pull roll 41 is disposed between the second unwind roll 31 and the pressure roll assembly 1, and the second pull roll 42 is disposed between the second wind-up roll 32 and the pressure roll assembly 1; the protective film 34 completely adheres to the electrode sheet 24 under the traction action of the first traction roller 41, then enters the press roller gap 13 together to start rolling, after the rolling is finished, the protective film 34 fully offsets the curling stress of the electrode sheet 24, and finally, after the combined protective film 34 and the electrode sheet 24 are output from the press roller gap 13 for a preset length, the protective film 34 is separated from the electrode sheet 24 under the traction action of the second traction roller 42, and the rolling is finished respectively.

The working process of the battery single-side pole piece rolling device is as follows: the rolled electrode sheet roll 23 and the protective film roll 33 are respectively arranged on a first unwinding roller 21 and a second unwinding roller 31 in advance, the first unwinding roller 21 and the second unwinding roller 31 are respectively driven to rotate by a motor, the electrode sheet 24 and the protective film 34 are respectively and uniformly pulled out from the electrode sheet roll 23 and the protective film roll 33 at a certain tension and speed, the protective film 34 is attached to the electrode sheet 24 under the traction action of a first traction roller 41, the electrode sheet 24 and the protective film 34 which are output from the press roll gap 13 enter the press roll gap 13 after being completely attached, the press roll assembly 1 is driven by the motor to start rolling, the electrode sheet 24 and the protective film 34 which are output from the press roll gap 13 are continuously kept attached to output a certain distance in the rolling direction, the curling stress generated on the electrode sheet 24 after the roll pressing of the electrode sheet 24 is offset by the protective film 34, and the protective film 34 is separated from the electrode sheet 24 under the traction action of a second traction roller 42 after being fully offset, the first wind-up roll 22 winds the electrode sheet 24 onto the first wind-up roll 22 at a certain tension and speed, and the second wind-up roll 32 winds the protective film 34 onto the second wind-up roll 32 at a certain tension and speed.

Preferably, the material of the protection film 34 should include a release film made of any one of PP (high polymer polypropylene), PVP (polyvinylpyrrolidone), PTFE (polytetrafluoroethylene), and PET (polyethylene terephthalate), or the material of the protection film 34 should include a composite film made of at least two of PP (high polymer polypropylene), PVP (polyvinylpyrrolidone), PTFE (polytetrafluoroethylene), and PET (polyethylene terephthalate). For example: the composite membrane is made of PP and PVP, or PP and PTFE, or PVP, PTFE and PET, which is not limited herein.

Preferably, the thickness of the protective film 34 is in the range of 30-500 μm, including 30 μm, 100 μm, 200 μm, 400 μm and 500 μm, and the thickness of the protective film 34 is greater than or equal to that of the electrode sheet 24; the width range of the protective film 34 is 50-500 mm, including 50mm, 100mm, 200mm, 400mm and 500mm, and the width of the protective film 34 is greater than or equal to the width of the coating layer.

Preferably, the protective film 34 is recyclable.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. A battery single-side electrode plate rolling device is characterized by comprising:

the compression roller assembly is provided with a compression roller gap;

the first coiling and uncoiling device is used for installing an electrode sheet coil, and an electrode sheet uncoiled from the electrode sheet coil penetrates through the compression roller gap;

and the second winding and unwinding device is used for installing a protective film coil, a protective film which is unwound from the protective film coil penetrates through the compression roller gap, and the protective film is positioned on one side of the electrode sheet, which deviates from the coating layer of the electrode sheet.

2. The battery single-sided electrode sheet rolling device according to claim 1, wherein the roller assembly comprises a first roller and a second roller, and the roller gap is formed between the roller surface of the first roller and the roller surface of the second roller.

3. The battery single face electrode sheet rolling device according to claim 2, wherein the roller assembly further comprises a roller gap adjusting device connecting at least one of the first roller and the second roller to adjust the size of the roller gap along a radial line between the first roller and the second roller.

4. The battery single-sided electrode sheet rolling device according to claim 1, wherein the first winding and unwinding device comprises a first unwinding roller and a first winding roller, and the first unwinding roller and the first winding roller are respectively positioned on two sides of the pressing roller assembly; the first unwinding roller is used for installing the electrode sheet roll which is unwound in advance, and the first winding roller is used for installing the electrode sheet roll which is wound in advance.

5. The battery single-sided electrode sheet rolling device according to claim 1, wherein the second winding and unwinding device comprises a second unwinding roller and a second winding roller, and the second unwinding roller and the second winding roller are respectively positioned on two sides of the pressing roller assembly; the second unwinding roller is used for installing the pre-unwound protective film roll, and the second winding roller is used for installing the pre-wound protective film roll.

6. The battery single face electrode sheet rolling device according to claim 5, further comprising a pull roll assembly; the traction roller assembly is used for drawing the conveying of the protective film which is uncoiled from the protective film coil.

7. The battery single face electrode sheet rolling device according to claim 6, wherein the pull roll assembly comprises a first pull roll and a second pull roll; the first traction roller is arranged between the second unwinding roller and the compression roller assembly and is used for adjusting the tension of the protective film between the second unwinding roller and the compression roller assembly so that the protective film is attached to the electrode sheet before passing through the compression roller gap; the second traction roller is arranged between the pressing roller assembly and the second winding roller and used for adjusting the tension of the protective film between the pressing roller assembly and the second winding roller, so that the protective film and the electrode plate which are compounded after being rolled are separated after the protective film and the electrode plate are output from the pressing roller gap by preset length.

8. The battery single-sided electrode sheet rolling device according to any one of claims 1 to 7, wherein the electrode sheet comprises a base layer and a coating layer, the coating layer is formed on one side of the base layer, and the protective film is attached to the other side of the base layer under the rolling of the roller assembly; the thickness of the protective film is larger than or equal to that of the base layer, and the width of the protective film is larger than or equal to that of the coating layer.

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